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Controlling breeding.

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So my co-worker has a tank in her office and she has guppies in it. They are doing what guppies do and that is breed like crazy. She loves them but doesn't really know much about fish. (I clean the tank for her). I keep telling her I need to separate the male from the females but she likes them too much. The tank is a ten gallon HEAVILY planted with four adult guppies (one male and three female). I was wondering if there was a fish that could fit comfortably with those guppies and would eat the babies?

You might be able to keep a betta with them. But is the thank is heavily planted then you might want to take out some plants it gives the baby's a place/places to hide. Guppy's will eat there baby's. But if the tank ha a lot of hiding places some baby's will live. With the betta just be careful about fin nipping I have never really had a problem with it. You could also get some dwarf frogs not african clawed frogs. The dwarf frog will eat the baby's just make sure it can't eat the guppy. Almost any fish you add to to the tank will eat the fry.

For a 10 gal she'd be better off with a male only tank. Those babies are going to have babies etc, etc. So either you're going to have to keep removing babies or quickly become overpopulated and face a potential tank crash. With 3 females there will be a lot of fry.

My guppies didn't eat their fry and I had to set up another tank to separate males and females. It was never ending removing males. Eventually, I did have a tank crash in my male tank as I had too many and no where else to put them.

In my 55G it's the neons that eat most of the babies, as far as I can see. My guppies never really seem to bother. I am down to 1 survivor per month, average as the neons are FAST. The betta was never really fats enough - he would give chase but give up very quickly, esp if the babies went into plants. In a 10G you are quite limited, so I would personally rehome the females and get the most beautiful males as permanent tank residents and leave it at that.

Almost anything will eat them, but the problem is finding something as fast and persistent enough to catch them. In a 10g, those options are very few. Separating them is the best and most responsible option.

IMHO, a frog is way too slow and blind to eat fry.

20 gallon with a male betta, neons, glowlights, and red cherry shrimp. (work in progess) Recently added a few LIVE plants and driftwood, Woooohoooo!